Hunter John,

I used 3f Goex. I wasn't fer sure just how easy BP is to get where damcl lives. With 3f Goex the MV is around 930 fps. This is a close range load. to 35 yards. As far as accuracy, if I aim dead center of a bright 1" dot, I'm going to hit it out to 35 yards. This in my 1:48 hawken which barrel is very pitted.

I've shot 5 rabbits so far this year, ranging from 10 to 25 yards, all were head shots.

I also mix 4 parts powder with 1 part compressed cornmeal, load my flask with that. Before filling the powder measure, I shake the flask to ensure its mixed thoroughly before measuring the charge. On a charge this small, I recommend the powder measure that has a sliding funnel which just help to be more consisten. If one mixes the cornmeal set the measure to 25 grains so that there is still 20 grains powder. I have been able to shoot consecutively 25+ rounds without swabbing my barrel (even once) with this arrangement. I use olive oil as patch lube and walmart pillowticking. I don't bother to carry cleaning patches or cleaning materials while hunting.
I know its a small charge but think of it like a very long pistol. I really like thisload for kids learning muzzleloading.This load would be hard pressed to develop 2000 psi. Even so its a hunting load if the right game is selected. Also it has very low report. In fact, the only sound I am able to detect is the firing of the cap. Below is chart of the ballistics.

If you want be to chrony 20 grains pyro P and RS, it wouldn't be any trouble, but I would expect pyro P to have more velocity, maybe 975 fps